Method of forming hollow glass articles.



K.JUNG. 7 METHOD OF FORMING HOLLOW GLASS ARTICLES. APPLICATION FILEDJULY 19, 1910.

Patented Feb. 6, 1912.

W/TNESSES INVENTO/P ATTORNEYS UNITED sTA'rEs PATENT oFFIoE.

KARL JUNG, OF GROSSIPRIESEN-ON-THE-ELBE, AUSTRIA-HUNGARY, ASSIGNOR TOTHE FIRM OF GLASFABRIKEN UND RAFFINERIEN JOSEF INWALD A. G.,"0F VIENNA,

AUSTRIA-HUNGARY.

METHOD OF FORMING HOLLOW GLASS ARTICLES.

To all whom it may concern.

Be it known that I, KARL JUNG, managing director, a subject of theEmperor of Austria-Hungary, residing at Grosspriesenon-the-Elbe, in theKingdom of Bohemia, Empire of Austria-Hungary, have invented certain newand useful Improvements in Methods of Forming Hollow Glass Articles, ofwhich the following is a specification, reference being had to theaccompanying drawing, forming a part of this specification, andillustrating one class of glassware to which the invention isapplicable.

Figure 1 is a side elevation of a finished globe; Fig. 2 is a transversesection of the same on line AB of Fig. 1; Fig. 3 is a side view of asmall globe of glass; Fig. 4 is a similar view of the said globe withthe colored glass thereon; Fig. 5 is a sectional view of a portion ofthe mold and globe of glass before the latter is pressed into the mold;and, Fig. 6 is a similar view with the glass pressed into the mold.

My invention relates to glass blowing, my more particular purpose beingto produce coloration effects in the manufacture of glass articles,such, for instance, as globes and shades made to represent flowers.

My invention further relates to the manufacture of so-called flashedglass articles having any desired pattern.

The steps of my process may be briefly summarized as follows: I dip up,inthe usual manner, a mass of molten glass from the hearth of the glassfurnace, and in doing this, I employ the usual implement, to wit, ablowing tube. The glass thus taken out hangs upon the end of the tube inthe form of a small globe a with a thick wall as shown in Fig. 3. Thisis next dipped into colored glass, to form a coating 1) of colored glassthereon, as shown in Fig. 4, the coating when first applied being quitethick. By blowing through the tube, the two colors of glass are renderedconcentric, that is, as the bulb is expanded, the colored glass takes upits position upon the outside, the colorless glass being concentric tothe colored glass and disposed inside of the latter. The bulb is furtherexpanded so that its wall is made thinner and is given a definiteconfiguration upon its external surface. This is Specification ofLetters Patent.

Application filed July 19, 1910.

Patented Feb. 6, 1912.

Serial No. 572,738.

I done by expanding the globe within a mold (Z having its inner surfacecorrugated as shown in Figs. 5 and 6. The sharp edges 0 of thecorrugations of the mold cut through the coating Z) of colored glass andform corrugations in the globe. This being done, the bulb may be removedand further treated. For instance, it may be reheated and expanded stillfurther. The corrugations upon it are by this step not altogetherdestroyed, but their depth represented by the thickness of the glassissomewhat less pronounced. The result is that the globe thus formed isslightly thicker in one place than at another place immediatelyadjacent, and the coloration of the glass is correspondingly dense wherethe glass is thickest, it being understood that the color is less denseat the points where it has been cut through by the edges of thecorrugations of the mold. The globe may now be finished, beingfashioned, for instance, into the form of a tulip, and the article thusfinished has variations in its thickness corresponding to thecorrugations originally imprinted by the mold, the corrugations,however, being much less pronounced than those imprinted by the mold,and the finished article further having a variation in its density ofcolor somewhat analogous to the variation in the thickness of its wall.The net result is that the finished pattern has the appearance of thefirst portion of glass taken up, this being superposed upon a ground.colored according to the color of the glass used in flashing.

The molds employed as above described are distinguished from variousother molds heretofore used by the employment of sharp inner edges whichserve to destroy and distribute the thickness of the glass andconsequently effect the variations in color.

I claim:

The method herein described of forming hollow glass articles, whichconsists of gathering a mass of molten glass, adding to the exterior ofsaid mass another mass of glass of a different color, partially blowingsaid mass as a single member thus forming a globe having the added massof glass distributed over the greater part of the globe, then furtherinflating said globe in a mold having its inner surface provided vvithcor- In testimony whereof I have afiixed my rugations or otherprojections adapted to signature in presence of two Witnesses. cutsubstantially through the outer mass of glass, then removing said globefrom said KARL JUNG' mold and further blowing the same, and Witnesses:

then converting said globe into a finished E1). PATsoH,

article.

ADoLPH FISCHER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

- Washington, D. C.

